CN105547463A - Monitoring system and method for vibration signal of on-load tap changer of power transformer - Google Patents
Monitoring system and method for vibration signal of on-load tap changer of power transformer Download PDFInfo
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- CN105547463A CN105547463A CN201410609297.1A CN201410609297A CN105547463A CN 105547463 A CN105547463 A CN 105547463A CN 201410609297 A CN201410609297 A CN 201410609297A CN 105547463 A CN105547463 A CN 105547463A
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Abstract
The invention discloses a monitoring system and method for a vibration signal of an on-load tap changer of a power transformer. The system is composed of a vibration sensor, a data acquisition instrument, and a monitoring unit. The vibration sensor arranged on the on-load tap changer is used for sensing a vibration signal generated by the on-load tap changer; the data acquisition instrument in signal connection with the vibration signal is used for collecting the vibration signal and converting the vibration signal into time domain and frequency domain atlases; and the monitoring unit in signal connection with the data acquisition instrument uses software to realize comparison of all atlases. According to the invention, state monitoring and fault analyses can be carried out on the on-load tap changer under the circumstance that no core suspension is carried out on the transformer, thereby achieving an objective of improvement of the maintenance quality of the on-load tap changer.
Description
Technical field
The present invention relates to transformer equipment status monitoring field, particularly relate to a kind of power transformer load tap changer vibration signal monitoring system and method.
Background technology
Load ratio bridging switch can not only steady load center voltage, and Football Association's network electrical network, adjustment load trend and improve without the indispensable visual plant of the distribution of work.But load ratio bridging switch is as the parts of rapid movement under high voltage and big current unique in transformer, very strict to mechanical property requirements, therefore promote incipient failure rate at it relatively high, have influence on the safe operation of electrical network.
Current when transformer whole failure rate is lower, the load ratio bridging switch fault ratio that still occupation ratio is larger.The reliability of load ratio bridging switch is generally ensured by periodicity scheduled overhaul (changing oil and suspended core etc.), service work spends half a day to time of one day to complete by several people usually, crucial pilot project is many carries out after suspended core, the workload of a suspended core is almost equivalent to an overhaul, and the repair based on condition of component of equipment oneself become the inexorable trend of grid maintenance.If new condition monitoring and fault diagnosis technology can be provided for load ratio bridging switch, under the prerequisite guaranteeing its reliability, extend the time between overhauls(TBO), then mean the reduction of the cost of overhaul; In addition, the human error of some load ratio bridging switch fault and maintainer is difficult to find in maintenance at present, adopts new condition monitoring and fault diagnosis technology to be also conducive to improving repair quality further.
Summary of the invention
The object of the present invention is to provide a kind of power transformer load tap changer vibration signal monitoring system and method, can when transformer not suspended core status monitoring and fault analysis are carried out to load ratio bridging switch, thus reach the object improving on-load tap switch maintenance quality.
In order to realize above-mentioned and other object, the invention provides a kind of power transformer load tap changer vibration signal monitoring system and method, comprising:
Vibration transducer, is arranged on load ratio bridging switch, the vibration signal that sensing load ratio bridging switch produces;
Data collecting instrument, is connected with described vibration sensor signal, gathers described vibration signal and converts time domain and frequency domain collection of illustrative plates to;
Monitoring means, is connected with described data collecting instrument signal, and the time domain collection of illustrative plates produce described data collecting instrument and the time domain collection of illustrative plates of normal condition compare, if TuPu method conforms to, are just shown as normal condition; If TuPu method is not inconsistent, just compare with multiple most common failure time domain collection of illustrative plates, if TuPu method conforms to, the energy Ratios that the frequency domain collection of illustrative plates just produced by described data collecting instrument and the frequency domain collection of illustrative plates of normal condition carry out energy spectrum analysis compares, if can show than conforming to, be just shown as normal condition; If energy Ratios is not inconsistent, the energy Ratios just carrying out energy spectrum analysis with multiple most common failure frequency domain collection of illustrative plates compares, if energy Ratios conforms to, just shows corresponding fault, if energy Ratios is not inconsistent, is just shown as new fault.
Be characterized as described monitoring means further and also comprise memory module, be used for storing time domain collection of illustrative plates and the frequency domain collection of illustrative plates of described normal condition and most common failure state.
Being characterized as described data collecting instrument analysis frequency is further more than 20KHz.
Be characterized as further most common failure time domain collection of illustrative plates comprise cylindrical shell fix bad, contact abrasion, annular strain, static contact loosen, contact bite, support fracture time domain collection of illustrative plates.
Be characterized as further most common failure frequency domain collection of illustrative plates comprise cylindrical shell fix bad, contact lung damage, annular strain, static contact loosen, contact bite, support fracture frequency domain collection of illustrative plates.
The sample frequency being characterized as described vibration transducer is further 51.2kHz, and the sampling time is 160ms, and pre-trigger is 60ms.
Being characterized as described vibration transducer is further piezoelectric type ICP type sensor.
The present invention also provides a kind of power transformer load tap changer vibration signal monitoring system and method, comprises following steps:
The vibration signal that sensing load ratio bridging switch produces;
Gather vibration signal and convert time domain and frequency domain collection of illustrative plates to;
By the time domain collection of illustrative plates comparison of described time domain collection of illustrative plates and normal condition, if TuPu method conforms to, be just shown as normal condition; If TuPu method is not inconsistent, just compare with multiple most common failure time domain collection of illustrative plates, if TuPu method conforms to, the energy Ratios just the frequency domain collection of illustrative plates of described frequency domain collection of illustrative plates and normal condition being carried out energy spectrum analysis compares, if energy Ratios conforms to, be just shown as normal condition; If energy Ratios is not inconsistent, the energy Ratios just carrying out energy spectrum analysis with multiple most common failure frequency domain collection of illustrative plates compares, if energy Ratios conforms to, just shows corresponding fault, if energy Ratios is not inconsistent, is just shown as new fault.
Be characterized as described energy spectrum analysis method further for calculating first frequency scope energy Ratios and second frequency scope energy Ratios in frequency domain collection of illustrative plates, the wherein energy/gross energy * 100% of first frequency scope energy Ratios=first frequency scope; Energy/gross energy the * 100% of the energy Ratios=second frequency scope of second frequency scope.
Being characterized as described first frequency scope is further 0 ~ 10KHz, and described second frequency scope is 10KHz ~ 20KHz.
Be characterized as further described most common failure time domain collection of illustrative plates comprise cylindrical shell fix bad, contact abrasion, annular strain, static contact loosen, contact bite, support fracture time domain collection of illustrative plates.
Be characterized as further described most common failure frequency domain collection of illustrative plates comprise cylindrical shell fix bad, contact abrasion, annular strain, static contact loosen, contact bite, support fracture frequency domain collection of illustrative plates.
Advantage of the present invention is: this system and method on load ratio bridging switch, arranges vibration transducer carry out perception vibration signal, so can not only when transformer not suspended core status monitoring and fault analysis are carried out to load ratio bridging switch, can also use under transformer shut down condition and use under transformer belt electricity condition.
Accompanying drawing explanation
The theory diagram of the power transformer load tap changer vibration signal monitoring system that Fig. 1 provides for the present invention one implementation column.
The process flow diagram of the power transformer load tap changer vibration signal monitoring method that Fig. 2 provides for the present invention one implementation column.
Fig. 3 is the time domain of normal condition and the collection of illustrative plates of frequency domain in the present invention one implementation column.
Fig. 4 is that the present invention one implementation column middle cylinder body fixes bad time domain and the collection of illustrative plates of frequency domain.
Fig. 5 is the time domain of contact abrasion state and the collection of illustrative plates of frequency domain in the present invention one implementation column.
Fig. 6 is the time domain of annular strain state and the collection of illustrative plates of frequency domain in the present invention one implementation column.
Fig. 7 is that in the present invention one implementation column, static contact loosens the time domain of state and the collection of illustrative plates of frequency domain.
Fig. 8 is the time domain of contact bite state and the collection of illustrative plates of frequency domain in the present invention one implementation column.
The time domain of Fig. 9 the present invention one implementation column medium-height trestle breaking state and the collection of illustrative plates of frequency domain.
Embodiment
Below by way of specific coenosarc example with reference, embodiments of the present invention are described, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention is also implemented by other different instantiation or is applied, and the every details in wooden instructions also can based on different viewpoints and application, carries out various modification and change not deviating under spirit of the present invention.
Please refer to Fig. 1, the theory diagram of its power transformer load tap changer vibration signal monitoring system provided for the present invention one implementation column.As shown in the figure, this system involving vibrations sensor 10, data collecting instrument 20 and prison trace back unit 30.Wherein vibration transducer 10 is arranged on load ratio bridging switch I, the vibration signal that sensing load ratio bridging switch 1 produces; Data collecting instrument 20 is connected with vibration transducer 10 signal, gathers vibration and turns vibration signal that sensor 10 senses and convert time domain and frequency domain collection of illustrative plates to; Monitoring means 30 is connected with data collecting instrument 20 signal, and the time domain collection of illustrative plates comparison of the time domain collection of illustrative plates produced by data collecting instrument 20 and normal condition, if TuPu method conforms to, is just shown as normal condition; If TuPu method is not inconsistent, just compare with multiple most common failure time domain collection of illustrative plates, if TuPu method conforms to, the energy Ratios that the frequency domain collection of illustrative plates just produced by described data collecting instrument 20 and the frequency domain collection of illustrative plates of normal condition carry out energy spectrum analysis compares, if energy Ratios conforms to, be just shown as normal condition; If energy Ratios is not inconsistent, the energy Ratios just carrying out energy spectrum analysis with multiple most common failure frequency domain collection of illustrative plates compares, if energy Ratios conforms to, just shows corresponding fault, if energy Ratios is not inconsistent, is just shown as new fault.
Preferably, vibration transducer I0 is three-dimensional vibrating sensor, magnet base can be utilized to be fixed in the tip position of the cylindrical shell of load ratio bridging switch, the output terminal of vibration transducer 10 is by joint connection data Acquisition Instrument 20, BNC connector preferably can be selected to connect, and certain the present invention is not as limit.Because energy spectrum analysis highest frequency is 20KHz, so the data collecting instrument analysis frequency selected is more than 20KHz, there is time domain, frequency domain, energy spectrum analysis function, after vibration transducer 10 collects vibration signal, this signal can be converted into the collection of illustrative plates of time domain and frequency domain.Piezoelectric type ICP type sensor selected by vibration transducer 10, the sample frequency of vibration acquisition is 51.2kHz, sampling time is 160ms, pre-trigger is 60ms, the collection of such guarantee vibration signal, certainly, the present invention is not as limit, and those skilled in the art also can select other more sensitive sensors.
Usually, memory module 31 is set in monitoring means 30, is used for storing time domain collection of illustrative plates and the frequency domain collection of illustrative plates of normal condition and common therefore scalariform state.And most common failure time domain collection of illustrative plates comprise simplified fixing bad, contact abrasion, annular strain, static contact loosen, the time domain collection of illustrative plates of contact bite, support fracture.Most common failure frequency domain collection of illustrative plates comprises cylindrical shell and fixes bad, that contact abrasion, annular strain, static contact loosen, contact bite, support rupture frequency domain collection of illustrative plates.
The exportable multiple text formatting of data collecting instrument 20, easy to use, such as conventional excel file layout exports.
Please refer to Fig. 2, it is the process flow diagram of power transformer load tap changer vibration signal monitoring method provided by the present invention.As shown in the figure, the method comprises the steps:
S10: the vibration signal that sensing load ratio bridging switch produces;
S20: gather vibration signal and convert time domain and frequency domain collection of illustrative plates to;
S30: by the time domain collection of illustrative plates comparison of time domain collection of illustrative plates and normal condition, if TuPu method conforms to, be just shown as normal condition; If TuPu method is not inconsistent, just carry out step S40;
Step S40: time domain collection of illustrative plates and multiple most common failure time domain collection of illustrative plates are compared, if TuPu method conforms to, just carries out step S50:
Step S50: the energy Ratios that the frequency domain collection of illustrative plates of described frequency domain collection of illustrative plates and normal condition carries out energy spectrum analysis is compared, if energy Ratios conforms to, is just shown as normal condition; If energy Ratios is not inconsistent, just carry out step S;
Step S60: the energy Ratios carrying out energy spectrum analysis with multiple most common failure frequency domain collection of illustrative plates compares, if energy Ratios conforms to, just shows corresponding fault, if energy Ratios is not inconsistent, is just shown as new fault;
Step S50 energy spectrum analysis method for calculating first frequency scope energy Ratios and second frequency scope energy Ratios in frequency domain collection of illustrative plates, wherein
Energy/gross energy the * 100% of first frequency scope energy Ratios=first frequency scope;
Energy/gross energy the * 100% of the energy Ratios=second frequency scope of second frequency scope.
General selected first frequency scope is 0 ~ 1OKHz, and second frequency scope is 1OKHz ~ 20KHz.
In power transformer load tap changer vibration signal monitoring system and method most common failure time domain collection of illustrative plates comprise cylindrical shell fix bad, contact abrasion, annular strain, static contact loosen, the time domain collection of illustrative plates of contact bite, support fracture, most common failure frequency domain collection of illustrative plates comprise cylindrical shell fix bad, contact abrasion, annular strain, static contact loosen, the frequency domain collection of illustrative plates of contact bite, support fracture.
Usually, monitoring means 30 can utilize a PC to realize, the various normal and time domain of malfunction of first typing load ratio bridging switch and the collection of illustrative plates of frequency domain in memory module 32 in monitoring means 30, as shown in Fig. 3 to Fig. 9, normal condition and time domain three-dimensional (x, y, the z) collection of illustrative plates of at least six kinds of most common failure states set up in advance, certainly be not limited to six kinds, the fault collection of illustrative plates in various situation can be set up as the case may be.
Fault diagnosis adopts the comprehensive criterion of time domain comparison and frequency domain energy comparison.For the situation of normal condition, first: carry out the course of action time domain of normal loaded switch and the typing of frequency domain collection of illustrative plates, there is certain difference in every platform loaded switch, as shown in Figure 3, time-domain diagram spectrum signature research under the normal condition of loaded switch: course of action 6Oms ~ 9Oms, visible two pulses, two interpulse periods one are decided to be 20ms, and two pulse amplitude sizes are close; Frequency domain collection of illustrative plates medium and low frequency energy 80% ~ 90%, high-frequency energy 10% ~ 20%.
Then, what the energy of Site Detection collection of illustrative plates time domain collection of illustrative plates and frequency spectrum is different from Fig. 3 feature is judged to abnormal conditions, is compared by the energy Ratios detecting frequency domain spectra, can obtain fault type with the energy Ratios of the common state in table.As detected the TuPu method that TuPu method comparison result is not shown, be just shown as new fault, or can resolve fault type, new fault graph spectrum signature is supplemented in storage unit.
On-load tap changers of transformers state monitoring method of the present invention, take classical force theory as foundation, based on vibration analysis theory, by the various normal and malfunction of simulation load ratio bridging switch, set up time domain collection of illustrative plates and the frequency domain figure spectrum signature of each state of load ratio bridging switch, by comparison and comprehensive analysis, realize the object of on-load tap changers of transformers condition monitoring and fault diagnosis.
On-load tap changers of transformers state monitoring method of the present invention, under transformer not suspended core state, can realize off-line and the presence prison side of loaded switch.
On-load tap changers of transformers state monitoring method of the present invention, can be connected with the Condition-based maintenance system of power transmission and transforming equipment, with the use of.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any those skilled in the art all without prejudice under spirit of the present invention and category, can carry out modifying to above-described embodiment and change.Therefore, the scope of the present invention, should listed by claims.
Claims (10)
1. power transformer load tap changer vibration signal monitoring system and a method, is characterized by, and comprising:
Vibration transducer, is arranged on load ratio bridging switch, the vibration signal that sensing load ratio bridging switch produces;
Data collecting instrument, is connected with described vibration sensor signal, gathers described vibration signal and converts time domain and frequency domain collection of illustrative plates to;
Monitoring means, is connected with described data collecting instrument signal, and the time domain collection of illustrative plates produce described data collecting instrument and the time domain collection of illustrative plates comparison of normal condition, if TuPu method conforms to, be just shown as normal condition; If TuPu method is not inconsistent, just compare with multiple most common failure time domain collection of illustrative plates, if TuPu method conforms to, the energy that the frequency domain collection of illustrative plates just produced by described data collecting instrument and the frequency domain collection of illustrative plates of normal condition carry out energy spectrum analysis compares, if energy Ratios conforms to, just be shown as normal condition, if energy Ratios is not inconsistent, the energy Ratios just carrying out energy spectrum analysis with multiple most common failure frequency domain collection of illustrative plates compares, if energy Ratios conforms to, just show corresponding fault, if energy Ratios is not inconsistent, be just shown as new fault.
2. according to a kind of power transformer load tap changer vibration signal monitoring system shown in claim 1 and method, it is characterized by, described monitoring means also comprises memory module, is used for storing time domain collection of illustrative plates and the frequency domain collection of illustrative plates of described normal condition and most common failure state.
3. according to a kind of power transformer load tap changer vibration signal monitoring system shown in claim 1 and method, it is characterized by, described data collecting instrument analysis frequency is more than 20KHz.
4. according to a kind of power transformer load tap changer vibration signal monitoring system shown in claim 1 and method, it is characterized by, described most common failure time domain collection of illustrative plates comprises cylindrical shell and fixes bad, that contact abrasion, annular strain, static contact loosen, contact bite, support rupture time domain collection of illustrative plates.
5. a kind of power transformer load tap changer vibration signal monitoring system according to claim I and method, it is characterized by, described most common failure frequency domain collection of illustrative plates comprise simplified fixing bad, contact abrasion, annular strain, static contact loosen, the frequency domain collection of illustrative plates of contact bite, support fracture.
6. according to a kind of power transformer load tap changer vibration signal monitoring system shown in claim 1 and method, it is characterized by, the sample frequency of described vibration transducer is 51.2kHz, and the sampling time is 160ms, and pre-trigger is 60ms.
7. according to a kind of power transformer load tap changer vibration signal monitoring system shown in claim 1 and method, it is characterized by, described vibration transducer is piezoelectric type ICP type sensor.
8. power transformer load tap changer vibration signal monitoring system and a method, is characterized by, and comprises following steps:
The vibration signal that sensing load ratio bridging switch produces;
Gather vibration signal and convert time domain and frequency domain collection of illustrative plates to;
By the time domain collection of illustrative plates comparison of described time domain collection of illustrative plates and normal condition, if TuPu method conforms to, be just shown as normal condition; If TuPu method is not inconsistent, just compare with multiple most common failure time domain collection of illustrative plates, if TuPu method conforms to, the energy Ratios just the frequency domain collection of illustrative plates of described frequency domain collection of illustrative plates and normal condition being carried out energy spectrum analysis compares, if energy Ratios conforms to, just be shown as normal condition, if energy Ratios is not inconsistent, the energy Ratios just carrying out energy spectrum analysis with multiple most common failure frequency domain collection of illustrative plates compares, if energy Ratios conforms to, just show corresponding fault, if energy Ratios is not inconsistent, be just shown as new fault.
9. power transformer load tap changer vibration signal monitoring system according to claim 8 and method, it is characterized by, described energy spectrum analysis method for calculating first frequency scope energy Ratios and second frequency scope energy Ratios in frequency domain collection of illustrative plates, the wherein energy/gross energy * 100% of first frequency scope energy Ratios=first frequency scope; Energy Ratios=second frequency the scope of second frequency scope can/gross energy * 100%.
10. power transformer load tap changer vibration signal monitoring system according to claim 8 and method, is characterized by, and described first frequency scope is 0 ~ 10KHz, and described second frequency scope is 10KHz ~ 20KHz.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106124973A (en) * | 2016-05-16 | 2016-11-16 | 国家电网公司 | Converter power transformer load ratio bridging switch on-line condition monitoring method |
| CN108535638A (en) * | 2018-01-25 | 2018-09-14 | 国网浙江省电力有限公司电力科学研究院 | Load ratio bridging switch machine performance monitoring method based on Multilayer filter and system |
| CN110595752A (en) * | 2019-09-26 | 2019-12-20 | 广州供电局有限公司 | Transformer on-load tap changer diagnostic system |
| CN111537919A (en) * | 2020-05-14 | 2020-08-14 | 莫毓昌 | Transformer fault diagnosis method based on voiceprint characteristics |
| CN111735533A (en) * | 2020-06-08 | 2020-10-02 | 贵州电网有限责任公司 | Transformer direct-current magnetic bias judgment method based on vibration signal wavelet energy spectrum characteristics |
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| DE19523352C1 (en) * | 1995-06-27 | 1996-10-10 | Reinhausen Maschf Scheubeck | Current monitoring device e.g. for electric conductor in on-load tap-switch |
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| CN102372102A (en) * | 2011-10-08 | 2012-03-14 | 深圳市味奇生物科技有限公司 | Code-spraying glue-spraying gland integrated machine |
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| DE19523352C1 (en) * | 1995-06-27 | 1996-10-10 | Reinhausen Maschf Scheubeck | Current monitoring device e.g. for electric conductor in on-load tap-switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106124973A (en) * | 2016-05-16 | 2016-11-16 | 国家电网公司 | Converter power transformer load ratio bridging switch on-line condition monitoring method |
| CN108535638A (en) * | 2018-01-25 | 2018-09-14 | 国网浙江省电力有限公司电力科学研究院 | Load ratio bridging switch machine performance monitoring method based on Multilayer filter and system |
| CN110595752A (en) * | 2019-09-26 | 2019-12-20 | 广州供电局有限公司 | Transformer on-load tap changer diagnostic system |
| CN111537919A (en) * | 2020-05-14 | 2020-08-14 | 莫毓昌 | Transformer fault diagnosis method based on voiceprint characteristics |
| CN111735533A (en) * | 2020-06-08 | 2020-10-02 | 贵州电网有限责任公司 | Transformer direct-current magnetic bias judgment method based on vibration signal wavelet energy spectrum characteristics |
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Application publication date: 20160504 |